Q. Calcium is obtained by
A) Electrolysis of molten ${CaCl}_{2}$
B) Roasting of lime stone
C) Reduction of ${CaCl}_{2}$ with carbon
D) Electrolysis of a solution of ${CaCl}_{2}$ in water
Explanation
(a)
$\ \ \ \ {CaCl}_{2}\ \ \rightarrow \ \ \ \ \ \ \ {Ca}^{2 +}\ \ \ \ \ 2{Cl}^{-}\$
$(molten)\ \ \ \ \ cathode\ \ \ \ anode$
$Cathode\ \ \ \ \ \ \ \ \ \ {Ca}^{2 +} + 2e^{-} \rightarrow Ca$
$Anode\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2{Cl}^{-} \rightarrow 2e^{-} + {Cl}_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.